Hypodermic syringe



Dec. 15, 1964 s. L. CHAPMAN HYPODERMIC SYRINGE Filed Feb. 4, 1963 INVENTOR SAMUEL. L--CHAPMA- United States Patent ()fiice 3,161,194 Patented Dec, 15, 1964 3,161,194 HYPQDERMIC SYRINGE Samuel L. Chapman, 2814 Conner St., Port Huron, Mich. Filed Feb. 4, 1963, Ser. No. 255,772 6 Claims. (Cl. 128218) This invention relates to hypodermic syringes and the like.

It is an object of the present invention to provide a hypodermic syringe which will save time, labor, and finance, such as in the operations of washing, sterilization, assembling and disassembling of the syringe, and also will be non-clogging.

Another object of the present invention is to provide a hypodermic syringe which will allow medical personnel to be able to use one syringe over and over, as many times as deemed necessary, without the contamination of the syringe and its contents.

A further object of the present invention is to provide a hypodermic syringe which will have a disposable encasement chamber with a means of locking it to the bottom of a plunger and will compress in a manner of an accordion and locking it in that position in order that it may be threaded into the bottom of the barrel of the syringe.

Other objects of the invention are to provide a hypodermic syringe bearing the above objects in mind which is of simple construction, has a minimum number of parts, is inexpensive to manufacture and eflicient in operation.

For other objects and for a better understanding of the invention reference may be had to the following detailed description taken in conjunction with the accompanying drawing, in which:

FIGURE 1 is a vertical view of a hypodermic syringe comprising the present invention;

FIGURE 2 is a side view shown exploded of the plunger locking device of the rubber encasement chamber shown in FIGURE 1; and

FIGURE 3 is a view taken on the lines 3-3 of FIG URE 2.

Referring to the drawing, a hypodermic syringe made in accordance with the present invention is shown to include an elongated and hollow glass barrel 12 which freely and slidably receives elongated glass plunger 14 having a flanged head 16. Plunger 14 is slidably received Within the bore 18 of glass barrel 12 and barrel 12 has a neck 21) at its lower end which is internally threaded for receiving a conical tip 22 having external threads above it. Conical tip 22 projects from a disposable encasement chamber 24 which is made of rubber and folds in an accordian like manner and provides a means for containing fluids for injection purposes. Encasement chamber 24 is provided with a lower end wall 26 which opens into the conical tip 22 for the ejection of fluid contained within. The upper end of encasement chamber 24 is provided with an upper end wall 28 which is fixedly secured to encasement chamber 24 and a pin 30 projects centrally downward within encasement chamber 24 and provides a means for threading the conical tip end of encasement chamber 24 into the neck 20 of barrel 12. End Wall 28 is provided on its external side with a flanged head 32 which is freely and slidably received within elongated slot 34 of rectangular configuration through the lower end of plunger 14 thus providing locking means for encasement chamber to plunger 14. The hollow injection needle 36 is threadingly received within the neck 2th of glass barrel 12.

In operation, plunger 14 is removed from within bore 18 of glass barrel 12 and the flanged head 32 of the thin rubber encasement chamber 24 is inserted into the slots 34 of plunger 14 and thus plunger 14 retains encasement chamber 24. The top and bottom of encasement chamber 24 is folded in an accordion like manner and locked thereby means of the pin 30 of end wall 28 and thus encasement chamber 24 is threadingly received by means of the external threads on the conical tip 22 into the neck 2% of barrel 12.

The disposable encasement chamber 24 is then filled by the operator pulling upward on plunger 14 which creates a vacuum within glass barrel 12 thus by differential in pressure the fluid for injection fills up the encasement chamber which will thus enable syringe'10 to be used for injection purposes.

It will be noted that the disposable encasement chamber 24 may be easily removed from within barrel 12 and the flanged head 32 removed from the slot 34 of plunger 14 after unthreading the conical tip 22 from within the neck 20 and thus encasement chamber 24 may bediscarded and a new one may be placed into position for further use.

It shall further be noted that end walls 26 and 28 are constructed of plastic material and the disposable encasement chamber 24 is constructed of thin wall rubber material thus providing easy compression thereof.

While various changes may be made in the detail construction it shall be understood that such changes shall be within the spirit and scope of the present invention as defined by the appended claims.

What I claim as new and desire to protect by Letters Patent of the United States is:

l. A hypodermic syringe comprising an elongated tubular barrel including a lower end having an opening extending therethrough, an internally threaded sleeve secured in said opening and extending from the lower end of the barrel, a radially outwardly extending annular flange at the upper end of said barrel, an encasement chamber positioned within said barrel comprising a thin rubber hollow cylinder collapsible in the manner of an accordion, a plastic inner end member adjacent the lower end of the barrel secured to one end of said rubber cylinder, an externally threaded conical projection on the outer side of the inner end member threadedly engaged with the interior of said sleeve and having a passage extending axially therethrough and an outer end member secured to the other end of the rubber cylinder, a central pin depending from the inner side of the outer end member which is bevelled at the free end thereof for encroaching upon the opening through the inner end wall of the encasement chamber to secure the outer end wall to the inner end wall so that torque can be transferred therebetween without producing torque in the rubber cylinder with the rubber cylinder in a collapsed position, an outer substantially rectangular flanged head on the outer side of the outer end wall of the encasement chamber, a hollow needle threadedly secured to the sleeve and a plunger extending into the upper end of the barrel having a transversely extending substantially rectangular recess therein receiving the flanged head on the outer end wall of the encasement chamber to facilitate expanding and collapsing of the encasement chamber on axial movement of the plunger within the barrel.

2. A hypodermic syringe comprising in combination a cylindrical barrel barrel having a closed end and an open end, a threaded opening through the closed end of the syringe barrel, an encasement chamber positioned in the barrel including a collapsible hollow cylinder and an inner end wall having an opening therethrough and an outer end wall secured to the opposite ends of the cylinder, means actuated by rotation of the chamber for se curing the encasement chamber to the closed end of the barrel with the opening through the inner end wall and barrel end in alignment, a hollow needle and means for encasement chamb'e'r cdllap the inner and outer end walls of the encasement chamber fqrpreventing tqr que transfer to the collapsible pfqrtipn 6f mange m at c am er pnrpta'tionpf th'e inner end \ivall of theencasenrent ch H end wall ther ebf with thefencas e en't'charnber in acclp o i qfis flb .v r. a in the Open end of the barrel and means'fqr 'secu v outer end Wall of the encasement chamber to the inner end of the plunger a'g ains't relative anal and rotational mg the 'iber ita a re the lower .7

rectangular flanged head on the outer side 9t th e 9n t er end Wall Of the encaser rient chamber and a correpbnding transversely extending substantially rectangular recess within the end of the plunger receiving the flanged head of the encasement chamber.

6. A disposable" encasement char'nberfo'r use in a hypddermic syringe or the like co'niprising a collapsible,

7 hollow cylinder, aseparate end wall secured to each of the opposite ends cf the Hollow cylinder one of which h np en ng, extendi h i th ghra hr ded Pwi non on'the *one end wan throifgh which the" opening" extends'andn eans operablebetw een the separate end/Wall's I 4'Q Structu're as set f IthinclainrZ wherein e61 j lap'sibl'cylind'er part of the encasement chamber is thin 7 rubber and the end Walls thereof 'are of rigid plastic,

, 5,; Structure as set fcrtli'in cliairn 2 herein the r'nea'ns for securing the outere nd'nkalldf the encasnint chamber to the inner end of the plunger 'cbniprise's' a substantially for transferring torque ebetween with the encasement in a 'collapsedpos'itio'n withbu't prducing'tbrq'ue in the hollo'vv cylinder. 7

References (l fted in the file 0f 7 UNITED STATES? 1*ATENTS' 7 

2. A HYPODERMIC SYRINGE COMPRISING IN COMBINATION A CYLINDRICAL BARREL HAVING A CLOSED END AND AN OPEN END, A THREADED OPENING THROUGH THE CLOSED END OF THE SYRINGE BARREL, AN ENCASEMENT CHAMBER POSITIONED IN THE BARREL INCLUDING A COLLAPSIBLE HOLLOW CYLINDER AND AN INNER END WALL HAVING AN OPENING THERETHROUGH AND AN OUTER END WALL SECURED TO THE OPPOSITE ENDS OF THE CYLINDER, MEANS ACTUATED BY ROTATION OF THE CHAMBER FOR SECURING THE ENCASEMENT CHAMBER TO THE CLOSED END OF THE BARREL WITH THE OPENING THROUGH THE INNER END WALL AND BARREL END IN ALIGNMENT, A HOLLOW NEEDLE AND MEANS FOR SECURING THE HOLLOW NEEDLE TO THE CLOSED END OF THE BARREL OVER THE OPENING THERETHROUGH, MEANS OPERABLE BETWEEN THE INNER AND OUTER END WALLS OF THE ENCASEMENT CHAMBER FOR PREVENTING TORQUE TRANSFER TO THE COLLAPSIBLE PORTION OF THE ENCASEMENT CHAMBER ON ROTATION OF THE INNER END WALL OF THE ENCASEMENT CHAMBER WITH RESPECT TO THE LOWER END WALL THEREOF WITH THE ENCASEMENT CHAMBER IN A COLLAPSED POSITION, A PLUNGER HAVING AN INNER END FITTING WITHIN THE OPEN END OF THE BARREL AND MEANS FOR SECURING THE OUTER END WALL OF THE ENCASEMENT CHAMBER TO THE INNER END OF THE PLUNGER AGAINST RELATIVE AXIAL AND ROTATIONAL MOVEMENT THEREBETWEEN. 